I assume the investments are in a tax deferred account. I'd do as others have suggested, but I'd start converting it over to a Roth IRA prior to age 70.5, when RMDs start. That will give him the option to manage income, reducing future RMD income and supplementing with Roth funds as needed.

Obviously, he should utilize the rest of his current tax bracket and he should look at his bracket with the RMDs. For example, I'm thinking RMDs will push us into the 25% tax bracket at some point. I'll be looking at converting to a Roth and maybe paying the 25% tax earlier, in order to avoid paying it over multiple years after age 70.5.

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